XML 96 R68.htm IDEA: XBRL DOCUMENT
v3.25.1

DERIVATIVE INSTRUMENTS - Summary of Swaptions Outstanding (Details) - Notional - Long Positions - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Long pay |  |  |
Derivative [Line Items] |  |  |
Current Underlying Notional | $ 1,000,000 |  | $ 0
Weighted Average Underlying Fixed Rate | 4.68% |  | 0.00%
Weighted Average Underlying Years to Maturity | 10 years 9 months 29 days | 0 years |
Weighted Average Months to Expiration | 9 months 29 days |  |
Long receive |  |  |
Derivative [Line Items] |  |  |
Current Underlying Notional | $ 0 |  | $ 0
Weighted Average Underlying Fixed Rate | 0.00% |  | 0.00%
Weighted Average Underlying Years to Maturity | 0 years | 0 years |
Weighted Average Months to Expiration |  |  |

X
- Definition Derivative Portfolio Expiration Period + References No definition available. + Details
Name: | nly_DerivativePortfolioExpirationPeriod
Namespace Prefix: | nly_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Interest rate swaptions weighted average underlying pay rate. + References No definition available. + Details
Name: | nly_InterestRateSwaptionsWeightedAverageUnderlyingPayRate
Namespace Prefix: | nly_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DerivativeAverageRemainingMaturity1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480237/815-40-50-5 + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=nly_InterestRateSwaptionPayMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PositionAxis=us-gaap_LongMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=nly_InterestRateSwaptionReceiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |